CN216950953U

CN216950953U - Air cycle machine

Info

Publication number: CN216950953U
Application number: CN202121422204.6U
Authority: CN
Inventors: 黄建平; 沈军; 符渡; 陈云飞; 于艳翠; 刘茂龙
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-06-24
Filing date: 2021-06-24
Publication date: 2022-07-12
Anticipated expiration: 2031-06-24

Abstract

The present disclosure provides an air cycle machine, a rotating shaft is supported by a first radial bearing, a second radial bearing and an axial bearing, the first radial bearing is arranged in a first bearing cavity, and the second radial bearing and the axial bearing are arranged in a second bearing cavity; the first bearing cavity is provided with a first air inlet channel and a first air outlet channel and is used for conveying cooling air for cooling the first radial bearing; the second bearing cavity is provided with a second air inlet channel and a second air exhaust channel and used for conveying cooling air for cooling the second radial bearing and the axial bearing. The air circulator disclosed by the invention is designed to accommodate the bearing cavity of the bearing device, and the cooling air flow is circularly input into the bearing cavity through the air inlet channel and the air outlet channel, and the cooling air flow only flows in the bearing cavity without entering and exiting the shaft core, so that the disturbance of the air flow to the rotor system is avoided. Meanwhile, the cooling air flow is in direct contact with the bearing device to be cooled, a large amount of heat of the bearing device is taken away, and the cooling effect is better.

Description

Air cycle machine

Technical Field

The present disclosure belongs to the technical field of air cycle machines, and particularly relates to an air cycle machine.

Background

The system adopts a compressed air circulation refrigeration system with air as a working medium, adopts a turbine compressor and an expander to respectively realize the compression and expansion processes, and simultaneously needs a fan to realize convection heat exchange. The gas expansion outputs work, and the gas compression and the fan supply need to consume work, so that the aim of saving energy can be fulfilled if the gas expansion work is used for the gas compression and the fan supply.

An air cycle machine for a compressed air refrigeration system includes a rotor assembly and a stationary assembly. The bearing system supports the rotor system assembly for high speed rotational movement relative to the bearing. The bearing can produce a large amount of heat, if not in time carry out the heat dissipation cooling, can cause the damage of bearing, influence air cycle machine's normal operating.

Disclosure of Invention

Accordingly, the technical problem to be solved by the present disclosure is that the bearings of the air cycle machine generate a large amount of heat, and need to be cooled by heat dissipation in time, thereby providing an air cycle machine.

In order to solve the above problems, the present disclosure provides an air cycle machine including:

the rotating shaft is supported by a first radial bearing, a second radial bearing and an axial bearing, the first radial bearing is arranged in a first bearing cavity, and the second radial bearing and the axial bearing are arranged in a second bearing cavity; the first bearing cavity is provided with a first air inlet channel and a first air outlet channel and is used for conveying cooling air for cooling the first radial bearing; and the second bearing cavity is provided with a second air inlet channel and a second air exhaust channel and is used for conveying cooling air for cooling the second radial bearing and the axial bearing.

The purpose of the present disclosure and the technical problems solved thereby can be further achieved by the following technical measures.

In some embodiments, the fan base is provided with a first bearing cavity, and the first air inlet channel and the first air outlet channel are both arranged on the fan base.

In some embodiments, a third sealing structure and a fourth sealing structure are arranged on the blower base, the rotating shaft is assembled on the blower base through the first radial bearing, and the blower base, the rotating shaft, the third sealing structure and the fourth sealing structure enclose the first bearing cavity.

In some embodiments, the bearing seat is included, the second bearing cavity is arranged on the bearing seat, and the second air inlet channel and the second air outlet channel are both arranged on the bearing seat.

In some embodiments, the bearing seat is provided with a first sealing structure and a second sealing structure, the rotating shaft is assembled on the bearing seat through the second radial bearing and the axial bearing, and the bearing seat, the rotating shaft, the first sealing structure and the second sealing structure enclose the second bearing cavity.

In some embodiments, the second air inlet channel corresponds to a position of the axial bearing, the second air outlet channel corresponds to a position of the second radial bearing, and cooling gas enters from the second air inlet channel, flows through the axial bearing and the second radial bearing in sequence, cools the axial bearing and the second radial bearing, and is then discharged from the second air outlet channel.

In some embodiments, the air conditioner further comprises an expander part, a compressor part and a fan part, wherein the expander part, the compressor part and the fan part are coaxially connected to the rotating shaft.

In some embodiments, the air-guiding pipeline is communicated with the inlet cavity of the expansion machine part at one end, and is communicated with the first air inlet channel and the second air inlet channel at the other end.

In some embodiments, the air-introducing pipeline includes an air-introducing channel, an air-guiding block, and an air-guiding tube, the air-introducing channel is disposed on an expansion casing of the expansion casing, one end of the air-introducing channel is communicated to an inlet cavity of the expansion casing, the other end of the air-introducing channel is communicated to the outside of the expansion casing, an air hole is disposed in the air-guiding block, the air-guiding block is mounted on an outer wall of the expansion casing, one end of the air hole corresponds to and is communicated with the air-introducing channel, the other end of the air hole is connected with the air-guiding tube, and the air-guiding tube is respectively communicated with the first air-introducing channel and the second air-introducing channel.

In some embodiments, the fan portion further comprises a second exhaust passage, and the second exhaust passage is communicated with the second exhaust passage.

In some embodiments, the first exhaust passage communicates at one end with the first bearing chamber and communicates at the other end with an air flow passage of the fan portion.

In some embodiments, the first radial bearing is a radial pneumatic bearing; and/or the second radial bearing is a radial pneumatic bearing; and/or the axial bearing is a thrust pneumatic bearing.

The present disclosure provides an air cycle machine having at least the following beneficial effects:

the air circulator disclosed by the invention is designed to accommodate the bearing cavity of the bearing device, and the cooling air flow is circularly input into the bearing cavity through the air inlet channel and the air outlet channel, and the cooling air flow only flows in the bearing cavity without entering and exiting the shaft core, so that the disturbance of the air flow to the rotor system is avoided. Meanwhile, the cooling air flow is in direct contact with the bearing device to be cooled, a large amount of heat of the bearing device is taken away, and the cooling effect is better.

Drawings

FIG. 1 is a cross-sectional view of an air cycle machine according to an embodiment of the present disclosure;

FIG. 2 is a perspective view of an air cycle machine according to an embodiment of the present disclosure.

The reference numerals are represented as:

1. a rotating shaft; 2. a first radial bearing; 3. a second radial bearing; 4. an axial bearing; 5. a first bearing cavity; 6. a second bearing cavity; 7. a first air intake passage; 8. a first exhaust passage; 9. a second intake passage; 10. a second exhaust passage; 11. a fan base; 12. a third seal structure; 13. a fourth seal structure; 14. a bearing seat; 15. a first seal structure; 16. a second seal structure; 17. an expander section; 18. a compressor section; 19. a fan section; 20. a bleed air line; 21. an exhaust line; 22. a bleed air passage; 23. a gas guide block; 24. air holes; 25. an air duct.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, the following embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings. It is to be understood that the described embodiments are merely a subset of the disclosed embodiments and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

With reference to fig. 1-2, an embodiment of the present disclosure provides an air cycle machine, including: the rotating shaft 1 is supported by a first radial bearing 2, a second radial bearing 3 and an axial bearing 4, the first radial bearing 2 is arranged in a first bearing cavity 5, and the second radial bearing 3 and the axial bearing 4 are arranged in a second bearing cavity 6; the first bearing cavity 5 is provided with a first air inlet channel 7 and a first air outlet channel 8 for conveying cooling air for cooling the first radial bearing 2; the second bearing cavity 6 is provided with a second air inlet channel 9 and a second air outlet channel 10 for conveying cooling air for cooling the second radial bearing 3 and the axial bearing 4.

According to the air cycle machine disclosed by the embodiment of the disclosure, aiming at the problems that in the related technology, a bearing cooling air path is arranged on a high-speed rotating shaft, cooling air flow needs to enter and exit from a shaft core, air flow disturbance can be caused to a rotor system, and instability of rotation of the rotor system is aggravated, a bearing cavity for accommodating a bearing device is designed, the cooling air flow is circularly input into the bearing cavity through an air inlet channel and an air outlet channel, the cooling air flow only flows in the bearing cavity, the air flow does not need to enter and exit from the shaft core, and disturbance of the air flow to the rotor system is avoided. Meanwhile, the cooling air flow is in direct contact with the bearing device to be cooled, a large amount of heat of the bearing device is taken away, and the cooling effect is better.

Preferably, the first radial bearing 2 is a radial pneumatic bearing; and/or the second radial bearing 3 is a radial pneumatic bearing; and/or the axial bearings 4 are thrust pneumatic bearings arranged in pairs. Accordingly, in the present embodiment, the shaft 1 is supported by the first radial bearing 2 and the second radial bearing 3 in the radial direction, and the shaft 1 is supported by the pair of thrust bearings in the axial direction, so that the shaft 1 can be rotated stably at high speed.

In some embodiments, the device further comprises an expander part 17, a compressor part 18 and a fan part 19, wherein the expander part 17, the compressor part 18 and the fan part 19 are coaxially connected to the rotating shaft 1. Preferably, the rotation power of the rotating shaft 1 comes from the expansion work of the gas, the gas enters the expander part 17 from the expander inlet T01 and then expands to do work, the temperature of the gas after the work is reduced, and the low-temperature gas flows out from the expander outlet T02 and is conveyed to the area needing refrigeration. The work of expansion drives the shaft 1 to rotate, and the compressor impeller of the compressor section 18 on the shaft 1 draws in gas from the compressor inlet C01, compresses it and discharges it from the compressor outlet C02. At the same time, the blades of the fan portion 19 on the rotating shaft 1 suck air from the fan inlet F01 and then discharge the air from the fan outlet F02 to drive the air.

Further, in the present embodiment, the first radial bearing 2 is disposed in the fan section 19, and the second radial bearing 3 and the axial bearing 4 are disposed close to each other while being disposed between the expander section 17 and the compressor section 18. The bearing supporting scheme of the embodiment can effectively reduce the system vibration of the rotating shaft 1, weaken the damage of the vibration of the rotating shaft 1 to the bearing device and improve the reliability of the bearing device.

In some embodiments, the air cycle machine comprises a fan base 11, the first bearing cavity 5 is arranged on the fan base 11, and the first air inlet channel 7 and the first air outlet channel 8 are both arranged on the fan base 11. Preferably, a third sealing structure 12 and a fourth sealing structure 13 are arranged on the fan base 11, the rotating shaft 1 is assembled on the fan base 11 through the first radial bearing 2, and the fan base 11, the rotating shaft 1, the third sealing structure 12 and the fourth sealing structure 13 enclose the first bearing cavity 5. In this embodiment, the fan base 11 is used as an important structure of the fan portion 19, and mainly plays a role in supporting the rotating shaft 1 and the fan blades, a dynamic sealing space is defined by the first bearing cavity 5 on which the first radial bearing 2 is accommodated by opening the fan base 11, the third sealing structure 12 and the fourth sealing structure 13 are respectively arranged on two axial sides of the first radial bearing 2, the first bearing cavity 5 on which the first radial bearing 2 is located is crossed by the rotating shaft 1, dynamic sealing is completed by the third sealing structure 12 and the fourth sealing structure 13, cooling gas is introduced inwards through the first air inlet channel 7, the cooling gas is in direct contact with the first radial bearing 2, and after absorbing heat, the cooling gas is discharged through the first air outlet channel 8, and the heat of the first radial bearing 2 is taken away, so as to cool the first radial bearing 2.

Further, the first exhaust passage 8 communicates at one end with the first bearing chamber 5 and at the other end with the air flow passage of the fan portion 19. Thereby, the air with the heat of the first radial bearing 2 is directly discharged to the outside of the air cycle machine through the fan section 19. Meanwhile, the first radial bearing 2 has a certain length along the axial direction of the rotating shaft 1, so that the first air inlet channel 7 and the first air outlet channel 8 can be selected to respectively correspond to the first bearing cavity 5 or the two axial ends of the first radial bearing 2, and therefore cooling air needs to flow for a certain distance along the axial direction of the rotating shaft 1 before being discharged in the first bearing cavity 5, especially can flow along the gap between the rotating shaft 1 and the first radial bearing 2, and therefore heat in the gap between the rotating shaft 1 and the radial bearing is taken away.

Preferably, an annular groove structure is formed on the inner wall of the first bearing cavity 5 corresponding to the first air inlet channel 7, so that the cooling gas flowing out from the first air inlet channel 7 is uniformly distributed in the circumferential direction of the first radial bearing 2 along the annular groove structure. Based on the same concept, the inner wall of the first bearing cavity 5 corresponding to the first exhaust passage 8 is also provided with an annular groove, so that the gas flowing through the gap between the rotating shaft 1 and the first radial bearing 2 can be rapidly collected along the annular groove and guided to the first exhaust passage 8 to be rapidly exhausted. The specific position of the annular groove structure in the present embodiment may be selected on the blower base 11, or may be selected on the third sealing structure 12 or the fourth sealing structure 13, and the specific position may be determined according to the positions of the first air intake passage 7 and the first air exhaust passage 8.

In some embodiments, the air cycle machine comprises a bearing seat 14, the second bearing cavity 6 is arranged on the bearing seat 14, and the second air inlet channel 9 and the second air outlet channel 10 are both arranged on the bearing seat 14. Preferably, a first sealing structure 15 and a second sealing structure 16 are arranged on the bearing seat 14, the rotating shaft 1 is assembled on the bearing seat 14 through the second radial bearing 3 and the axial bearing 4, and the bearing seat 14, the rotating shaft 1, the first sealing structure 15 and the second sealing structure 16 enclose the second bearing cavity 6. In this embodiment, the bearing seat 14 is used as an important structure of the air cycle machine, and mainly plays a role of supporting the rotating shaft 1, the bearing seat 14 is provided with the second bearing cavity 6 for accommodating the second radial bearing 3 and the axial bearing 4, the first sealing structure 15 and the second sealing structure 16 are respectively arranged on the two axial sides of the second radial bearing 3 and the axial bearing 4, the second bearing cavity 6 is enclosed into a dynamic sealing space, the rotating shaft 1 passes through the second bearing cavity, the dynamic sealing is completed by the first sealing structure 15 and the second sealing structure 16, cooling gas is introduced inwards through the second air inlet channel 9, the cooling gas is in direct contact with the second radial bearing 3 and the axial bearing 4, and after absorbing heat, the cooling gas is discharged through the second air outlet channel 10 to take away heat of the second radial bearing 3 and the axial bearing 4, so as to cool the bearings.

In some embodiments, the second air inlet channel 9 corresponds to a position of the axial bearing 4, the second air outlet channel 10 corresponds to a position of the second radial bearing 3, and the cooling gas enters from the second air inlet channel 9, flows through the axial bearing 4 and the second radial bearing 3 in sequence, cools the axial bearing 4 and the second radial bearing 3, and is then discharged from the second air outlet channel 10. Therefore, when the axial bearing 4 adopts a thrust disc structure, cooling gas enters the second bearing cavity 6 from the second gas inlet channel 9, firstly flows in a shunting way along the radial direction and flows along the two axial side surfaces of the thrust disc, then flows axially along the gap between the second radial bearing 3 and the rotating shaft 1, reaches the second gas exhaust channel 10 and finally flows out, so that the simultaneous cooling of the axial bearing 4 and the second radial bearing 3 is realized, and the working performance of the bearing is ensured.

In some embodiments, the air cycle machine further comprises a bleed air line 20, and the bleed air line 20 is connected to the inlet chamber of the expander portion 17 at one end and is connected to the first and second inlet channels 7 and 9 at the other end. Preferably, the bleed air pipeline 20 includes a bleed air channel 22, an air guide block 23, and an air guide tube 25, the bleed air channel 22 is disposed on an expansion casing of the expansion casing 17, one end of the bleed air channel 22 is communicated to an inlet cavity of the expansion casing 17 inside the expansion casing, the other end of the bleed air channel 22 is communicated to the outside of the expansion casing, an air hole 24 is disposed in the air guide block 23, the air guide block 23 is mounted on an outer wall of the expansion casing, one end of the air hole 24 corresponds to and is communicated with the bleed air channel 22, the other end of the air hole 24 is connected to the air guide tube 25, and the air guide tube 25 is respectively communicated with the first air inlet channel 7 and the second air inlet channel 9.

Therefore, the air cycle machine of the embodiment can introduce the high-pressure and low-temperature gas which just flows into the expansion shell into the first bearing cavity 5 and the second bearing cavity 6 for cooling the bearing, compared with the air-entraining machine adopting other parts, the gas in the inlet cavity of the expansion machine part 17 is compressed by the compressor part 18, and the high-pressure gas with the temperature within the range of 50-60 ℃ after heat exchange and temperature reduction for many times can improve the cooling airflow with enough pressure and cold quantity, thereby having better cooling effect.

In some embodiments, the air cycle machine further comprises an exhaust duct 21, one end of the exhaust duct 21 communicates with the air flow passage of the fan section 19, and the other end communicates with the second exhaust passage 10. In this embodiment, the first bearing cavity 5 is disposed on the fan base 11 and can be communicated with the air flow channel of the fan portion 19 only through the first exhaust channel 8, so as to achieve the exhaust of the cooling gas, while the second bearing cavity 6 is disposed in the bearing base 14 and is far away from the air flow channel of the fan portion 19, so that a special pipeline needs to be added, and the second exhaust channel 10 is communicated with the air flow channel of the fan portion 19 by using an external pipeline. Optionally, the air holes 24 are formed in the fan seat 11, the air holes 24 are communicated with the air flow channel, and the external pipeline is only connected to the air holes 24, so that the cooling gas can be discharged.

Preferably, in the scheme that uses air duct or external pipeline, the pipe fitting sets up the mounting with bearing

frame

14 or 11 junctions of fan seat, through structures such as screw with pipe fitting fixed connection on bearing frame 14 or fan seat 11, guarantees the bearing capacity and the joint strength of pipe fitting.

First radial bearing 2 adopts a cooling branch road in this embodiment, and second radial bearing 3, axial bearing 4 adopt another cooling branch road, and two cooling branch roads bleed from the expansion shell jointly, later independently cool off and flow, and the bearing at different positions independently cools off, and the cooling gas is discharged alone again simultaneously, can guarantee that every bearing homoenergetic obtains good cooling.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present disclosure is to be considered as limited only by the preferred embodiments and not limited to the specific embodiments described herein, and all changes, equivalents and modifications that come within the spirit and scope of the disclosure are desired to be protected. The foregoing is only a preferred embodiment of the present disclosure, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present disclosure, and these improvements and modifications should also be considered as the protection scope of the present disclosure.

Claims

1. An air cycle machine, comprising:

the rotating shaft (1) is supported by a first radial bearing (2), a second radial bearing (3) and an axial bearing (4), the first radial bearing (2) is arranged in a first bearing cavity (5), and the second radial bearing (3) and the axial bearing (4) are arranged in a second bearing cavity (6); the first bearing cavity (5) is provided with a first air inlet channel (7) and a first air outlet channel (8) which are used for conveying cooling air for cooling the first radial bearing (2); the second bearing cavity (6) is provided with a second air inlet channel (9) and a second air exhaust channel (10) which are used for conveying cooling air for cooling the second radial bearing (3) and the axial bearing (4).

2. An air cycle machine according to claim 1, characterized by comprising a fan block (11), the first bearing chamber (5) being provided on the fan block (11), the first air inlet channel (7) and the first air outlet channel (8) each opening on the fan block (11).

3. The air cycle machine according to claim 2, wherein a third sealing structure (12) and a fourth sealing structure (13) are arranged on the fan base (11), the rotating shaft (1) is assembled on the fan base (11) through the first radial bearing (2), and the fan base (11), the rotating shaft (1), the third sealing structure (12) and the fourth sealing structure (13) enclose the first bearing cavity (5).

4. The air cycle machine according to claim 1, characterized by comprising a bearing seat (14), wherein the second bearing cavity (6) is arranged on the bearing seat (14), and the second air inlet channel (9) and the second air outlet channel (10) are both opened on the bearing seat (14).

5. The air cycle machine according to claim 4, characterized in that a first sealing structure (15) and a second sealing structure (16) are arranged on the bearing seat (14), the rotating shaft (1) is assembled on the bearing seat (14) through the second radial bearing (3) and the axial bearing (4), and the bearing seat (14), the rotating shaft (1), the first sealing structure (15) and the second sealing structure (16) enclose the second bearing cavity (6).

6. The air cycle machine according to claim 5, wherein the second air inlet channel (9) corresponds to the position of the axial bearing (4), the second air outlet channel (10) corresponds to the position of the second radial bearing (3), and cooling air enters from the second air inlet channel (9), flows through the axial bearing (4) and the second radial bearing (3) in sequence, and is discharged from the second air outlet channel (10).

7. The air cycle machine of claim 1, further comprising an expander section (17), a compressor section (18), and a fan section (19), wherein the expander section (17), the compressor section (18), and the fan section (19) are coaxially connected to the shaft (1).

8. The air cycle machine according to claim 7, further comprising a bleed air line (20), the bleed air line (20) communicating at one end to the inlet chamber of the expander portion (17) and at the other end to the first and second intake passages (7, 9), respectively.

9. The air cycle machine of claim 8, wherein the bleed air line (20) includes a bleed air channel (22), an air guide block (23), an air guide tube (25), the bleed air channel (22) is arranged on an expansion housing of the expander section (17), one end of the bleed air channel (22) is communicated to an inlet cavity of the expander part (17) inside the expansion casing, the other end of the air guide channel (22) is communicated to the outside of the expansion shell, an air hole (24) is arranged in the air guide block (23), the air guide block (23) is arranged on the outer wall of the expansion shell, one end of the air hole (24) corresponds to and is communicated with the air guide channel (22), the other end of the air hole (24) is connected with an air duct (25), and the air duct (25) is respectively communicated with the first air inlet channel (7) and the second air inlet channel (9).

10. The air cycle machine of claim 7, further comprising an exhaust duct (21), the exhaust duct (21) communicating at one end into the air flow path of the fan section (19) and at the other end with the second exhaust passage (10).

11. The air cycle machine of claim 10, wherein the first exhaust passage (8) communicates at one end with the first bearing cavity (5) and at the other end with an air flow passage of the fan section (19).

12. An air cycle machine according to any of claims 1-11, characterized in that the first radial bearing (2) is a radial pneumatic bearing; and/or the second radial bearing (3) is a radial pneumatic bearing; and/or the axial bearing (4) is a thrust pneumatic bearing.